There are a lot of pouches out there that you can jam AK mags into… Withdrawing them again without the locking lugs snagging and tearing your pouch to shreds is the hard part.
Enter Hugo Industries with their Snag-Free AK Mag Insert. Their insert uses polymer rails to prevent AK-74 and AK-47 locking lugs from snagging. It is compatible with most chest rigs that accept inserts and is likely compatible with plate carrier kangaroo pockets as well. Hugo Industries provides size information so you can check the fit with your potential application.